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What is the average velocity of the molecules of an ideal gas?

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in Engineering Physics I by (558k points)
What is the average velocity of the molecules of an ideal gas?

(a) Infinity

(b) Constant

(c) Unstable

(d) Zero

I had been asked this question in an online quiz.

This intriguing question originated from Kinetic Theory of Gases topic in chapter Kinetic Theory of Gases of Engineering Physics I

1 Answer

+1 vote
by (1.4m points)
Right option is (d) Zero

The explanation: The average velocity of the molecules of an ideal gas is zero because the molecules possess all sorts of velocities in all possible directions so their vector sum and hence the average is zero.

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